can be written as 
,so it is a rational number.
can be written as 
,so it is a rational number.
cannot be written as a fraction,so it is not a rational number.
can be written as 
,so it is a rational number.
can be written as 
can be written as 
,so it is a rational number.
cannot be written as a fraction,so it is not a rational number.List all rational numbers
let a={0,0.,β3,2,-2/3,-7,β7}...
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